电工技术学报2019，Vol.34Issue(2)：286-295,10.DOI:10.19595/j.cnki.1000-6753.tces.171634
基于可控开关电容的定频谐振式多路LED均流驱动器
A Constant Frequency Resonant Multi-Channel LED Driver Based on Switch-Controlled Capacitor
摘要
Abstract
The current sharing scheme of capacitive impedance matching has been widely used to eliminate current imbalance duo to simple control versus easy expansion.However, as the number of strings increases, the current sharing effect decreases, and the reactive loss increases.At the same time, traditional topologies using pulse frequency modulation (PFM) are bound to cause high electro magnetic interference (EMI).In this paper, a novel LED driver with the current sharing is proposed under constant frequency operation.The proposed converter can be derived by upper and lower half-bridge interleaved output, which greatly alleviates the unbalance of multiple LED and loss caused by capacitive mismatch.Meanwhile, LED wide range dimming with the constant frequency is achieved by using the switch-controlled capacitor (SCC) module of the resonant unit.Since the switching circuit adopts PWM and can realize soft-switching, the conversion efficiency of the machine is high.Finally, experimental prototype of 12 W was designed to realize 4-channel LED current-sharing dimming, which verified the feasibility of the LED driver.关键词
恒频/可控开关电容/软开关/多路均流/谐振/LED调光Key words
Constant frequency/switch-controlled capacitor/soft-switching/multi-channel current sharing/resonant/LED dimming分类
信息技术与安全科学引用本文复制引用
田涵雷,刘俊峰,曾君,梁国壮..基于可控开关电容的定频谐振式多路LED均流驱动器[J].电工技术学报,2019,34(2):286-295,10.基金项目
国家自然科学基金(61573155) （61573155）
广东省自然科学基金(No.2016A030313508) （No.2016A030313508）
广东省科技计划(No.2016A010102007)资助项目 （No.2016A010102007）
